I honestly can't speak with any authority to any car other than this very specific one. IIRC there were a handful of parts spec'd from other factory racecars including the 917 and the brakes may be included in that. There was less than 500 RSRs built (according to my neighbor from so many years ago) and the low number and special parts may account for the discrepancy between CarerraRSeattle's account of caliper location and mine. Any other car and I'd be lost.
Now if you'll excuse me I've got to call my parents up and have them dig through old photos of my childhood, I've got something in there that probably should have been framed years ago.